World Formula Engine by Briggs & Stratton Racing

World Formula Discussion

World Formula

Building off of the success of the Animal Racing engine, the World Formula was launched in 2003 in accordance with the CIK World Formula class rules. This complete engine package balances the latest in engine design and technology to provide racers with a consistent, low-maintenance and low-cost platform, in which to sharpen their driving skills and chassis setup. Hand-built and individually tested in our Milwaukee, Wisconsin skunk works

Dual Ball-Bearing, RACING Reinforced Cylinder
Billet Rod
Slotted, Stelite-Faced, Ground Cam w/ Compression Release
Dual, High-Silicon Valve Springs
PVL™ Digital Ignition System w/7,100 RPM Limiter
CNC D-Shape Intake Port
Walbro™ Round - Slide Carburetor
Dana™ Fire-Ring Head Gasket
Racing Crankshaft w/ Induction-Hardened Crankpin
Green™ Air Filter
Federal Mogul™ Moly-Coated Cam Ground, Barrel-Faced Piston
Chrome-Faced, Racing Only Ring Package
Port-Liner, Exhaust System
Mikuni™ Fuel Pump
Noram™ Clutch w/ Quick Change Sprocket Set
Automotive 3-Piece Valve Retainer System
Beefy Rocker Arm Stud Nuts

Model Number 124335
Type 8105-01
Displacement 206
Bore 2.6875/2.6885
Stroke 2.2
Compression Ratio 9.5 to 1
Factory Timing 29 degrees BTDC
Description Wrench / socket size Torque
Air Guard 7mm 40-50 lb-in. (4.5-5.6 Nm)
Blower Housing 10mm & 3/8" 60-110 lb-in. (7-12.5 Nm)
Carburetor (to manifold) 10mm 80-110 lb-in. (9-12.4 Nm)
Connecting Rod T27 140-150 lb-in. (16-17 Nm)
Cylinder Head Bolts 10mm 200-220 lb-in. (20-27 Nm)
Exhaust Brace Screws 10mm 95-125 lb-in. (11-14 Nm)
Exhaust Stud 10mm 95-125 lb-in. (11-14 Nm)
Flywheel Nut 15/16" 55-75 ft-lbs. (74.5-101 Nm)
Flywheel Fan 10mm 180-240 lb-in. (20-27 Nm)
Intake (to cylinder) 5mm Allen 70-90 lb-in. (8-10.2 Nm)
Oil Drain Plug 3/8" 100-125 lb-in. (11-14 Nm)
PVL Module 7mm 20-35 lb-in. (2.3-4 Nm)
Rocker Arm Stud 7/16" 90-120 lb-in. (10-14 Nm)
Rocker Arm Plate 10mm 70-90 lb-in. (7.9-10.1 Nm)
Rocker Arm Set Screw 1/8" Allen 50-70 lb-in. (5.6-7.9 Nm)
Spark Plug 5/8" Deep 95-145 lb-in. (11-16.4 Nm)
Side Cover 10mm 140-170 lb-in. (16-19 Nm)
Starter Gear #2 Phillips 35-53 lb-in. (4-6 Nm)
Top Control Plate 10mm 70-90 lb-in. (8-10 Nm)
Valve Cover 10mm Lower & 3/8" 30-60 lb-in. (3.5-7 Nm)

Hello, Would the world-class fit into the 120 Arctic cat chassis with out any fabraction?  Thanks.

Asked by: Oldskoolp
The Briggs & Stratton racing engines are meant for sanctioned racing event only. Please work with a Racing dealer found here:
Answered by: Nicole_BriggsStratton
Date published: 2015-03-11

I have a World Formula, the carb was damaged and a new one needed. I have two part numbers for this carb 557006 & 555658, what is the difference? Which one should I use?

Asked by: T bird
Please work with a Briggs racing dealer to determine what parts are needed. You can find a dealer here:
Answered by: Nicole_BriggsStratton
Date published: 2015-03-03

How do you index a spark plug on world formula engine.

Asked by: saumsz
Please work with a local racing service tech for repair and maintenance information on the racing engines. You can find a dealer here:
Answered by: Nicole_BriggsStratton
Date published: 2015-03-03

I am trying to make a holder for my world formula carb jets, was size are the threads ?

Asked by: bucky6767
Please visit for a manual on this engine, which includes parts and the specifications.
Answered by: Nicole_BriggsStratton
Date published: 2015-02-11

What is the weight of a world formula engine

Asked by: Dick 501
It is approximately 38 pounds.
Answered by: Nicole_BriggsStratton
Date published: 2015-02-22

whats the top end speed of this engine? And, whats the pricing?

Asked by: Scott B
We will not have pricing as we do not sell direct. Please work with a local technical dealer for assistance:
Answered by: Nicole_BriggsStratton
Date published: 2014-12-03

Best exhaust system for us to run on world formula in a Jr sprint car?can't even hear our car compared the others and leaving us on the starts.we all are supposed to be stock motor internals.tried different gears didn't help much.they have different exhau

Asked by:
We were having the same problem.  check your clutch engagement RPM at least 4000.  ours was too low as well as the clutch disks were glazed over and would not kick in.  Once I reset the clutch engagement RPM and scuffed the clutch disks it took off like it did before
Answered by: racer124
Date published: 2015-03-14

I need to replace the intake (between carb and motor) because it must come stright out the side in a kid´s snowmobile. Can you help me with a parts number?

Asked by: Max3
To locate any information on your engine, you will first need the model type and code. Please see the following link for assistance in locating these numbers: Once you have this information you can find information on your engine here: Select engine as your product type and follow the directions for entering the model type and trim into the search fields.
Answered by: Nicole_BriggsStratton
Date published: 2014-09-02
  • 2015-03-27T06:22CST
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